Dechlorination: Sulphur, particularly in the form of elemental sulphur or sulphur compounds, can be used for dechlorination in water treatment. It reacts with chlorine residual in water, converting it into less harmful chloride compounds. Dechlorination is important to ensure that treated water meets regulatory standards and is safe for consumption.

Reducing Agent: In specific water treatment applications, sulphur can serve as a reducing agent. It can help reduce the oxidation state of certain contaminants, making them easier to remove through subsequent treatment processes. Sulphur-based reducing agents can be used to treat oxidized water sources or wastewater streams containing oxidized pollutants.

PH Adjustment: Sulphuric acid (a derivative of sulphur) can be used for pH adjustment in water treatment. By adding sulphuric acid, the pH of water can be lowered, which is sometimes necessary to optimize the effectiveness of coagulants or other treatment chemicals.

Alkalinity Reduction: In specific cases where high alkalinity is an issue, elemental sulphur or sulphur compounds can be used to reduce alkalinity levels in water. This can help stabilize pH and prevent scaling or other issues associated with high alkalinity.